气候变化领域集成服务门户(CCPortal): Surface mass balance downscaling through elevation classes in an Earth system model: Application to the Greenland ice sheet

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DOI	10.5194/tc-13-3193-2019
	Surface mass balance downscaling through elevation classes in an Earth system model: Application to the Greenland ice sheet
	Sellevold R.; Van Kampenhout L.; Lenaerts J.T.M.; Noël B.; Lipscomb W.H.; Vizcaino M.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	3193
结束页码	3208
卷号	13 期号:12
英文摘要	The modeling of ice sheets in Earth system models (ESMs) is an active area of research with applications to future sea level rise projections and paleoclimate studies. A major challenge for surface mass balance (SMB) modeling with ESMs arises from their coarse resolution. This paper evaluates the elevation class (EC) method as an SMB downscaling alternative to the dynamical downscaling of regional climate models. To this end, we compare EC-simulated elevation-dependent surface energy and mass balance gradients from the Community Earth System Model 1.0 (CESM1.0) with those from the regional climate model RACMO2.3. The EC implementation in CESM1.0 combines prognostic snow albedo, a multilayer snow model, and elevation corrections for two atmospheric forcing variables: temperature and humidity. Despite making no corrections for incoming radiation and precipitation, we find that the EC method in CESM1.0 yields similar SMB gradients to RACMO2.3, in part due to compensating biases in snowfall, surface melt, and refreezing gradients. We discuss the sensitivity of the results to the lapse rate used for the temperature correction. We also evaluate the impact of the EC method on the climate simulated by the ESM and find minor cooling over the Greenland ice sheet and Barents and Greenland seas, which compensates for a warm bias in the ESM due to topographic smoothing. Based on our diagnostic procedure to evaluate the EC method, we make several recommendations for future implementations. © 2019 Author(s).
学科领域	atmospheric forcing; climate modeling; downscaling; elevation; ice sheet; paleoclimate; precipitation (climatology); regional climate; sea level change; surface energy; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	atmospheric forcing; climate modeling; downscaling; elevation; ice sheet; paleoclimate; precipitation (climatology); regional climate; sea level change; surface energy; Arctic; Greenland; Greenland Ice Sheet
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118800
作者单位	Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Sellevold R.,Van Kampenhout L.,Lenaerts J.T.M.,et al. Surface mass balance downscaling through elevation classes in an Earth system model: Application to the Greenland ice sheet[J],2019,13(12).
APA	Sellevold R.,Van Kampenhout L.,Lenaerts J.T.M.,Noël B.,Lipscomb W.H.,&Vizcaino M..(2019).Surface mass balance downscaling through elevation classes in an Earth system model: Application to the Greenland ice sheet.The Cryosphere,13(12).
MLA	Sellevold R.,et al."Surface mass balance downscaling through elevation classes in an Earth system model: Application to the Greenland ice sheet".The Cryosphere 13.12(2019).